package top.kiterunner.learning.utility_demo.thread_pool;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * AdorynZhao in Tencent-UESTC.
 * Source Code Created on 2017/7/30.
 */
public class SimpleHttpServer {

    //处理HttpRequst的线程池
    static ThreadPool<HttpRequestHandler> threadPool = new DefaultThreadPool(1);

    static String basePath;
    static ServerSocket serverSocket;

    static int port = 8080;

    public static void setPort(int port) {
        if (port > 0)
            SimpleHttpServer.port = port;
    }

    public static void setBasePath(String basePath) {
        if (basePath != null && new File(basePath).exists() && new File(basePath).isDirectory()){
            SimpleHttpServer.basePath = basePath;
        }
    }

    public static void start() throws Exception {
        serverSocket = new ServerSocket(port);

        Socket socket = null;

        while ((socket = serverSocket.accept()) != null) {
            threadPool.execute(new HttpRequestHandler(socket));
        }

        serverSocket.close();
    }

    static class HttpRequestHandler implements Runnable {

        private Socket socket;

        public HttpRequestHandler(Socket socket) {
            this.socket = socket;
        }

        @Override
        public void run() {
            String line = null;
            BufferedReader br = null;
            BufferedReader reader = null;
            PrintWriter out = null;
            InputStream in = null;

            try {
                reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                String header = reader.readLine();
                String filePath = basePath + header.split(" ")[1];
                out = new PrintWriter(socket.getOutputStream());

                br = new BufferedReader(new InputStreamReader(new FileInputStream(filePath)));
                out = new PrintWriter(socket.getOutputStream());
                out.println("HTTP/1.1 200 OK");
                out.println("Server: Molly");
                out.println("Content-Type: text/html; charset=UTF-8");
                out.println();
                while ((line = br.readLine()) != null) {
                    out.println(line);
                }
                out.flush();
            } catch (Exception e) {
                out.println("HTTP/1.1 500");
                out.println();
                out.flush();
            } finally {
                close(br, in, reader, out, socket);
            }
        }

    }

    private static void close(Closeable... closeables) {
        if (closeables != null) {
            for (Closeable closeable : closeables) {
                try {
                    closeable.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}
